The multistar Welcome Home concert honoring America's Vietnam veterans and scheduled for July 4 at RFK Stadium has been moved to a new location because of poor ticket sales. As of yesterday, two weeks after tickets went on sale, fewer than 9,000 seats out of 52,000 had been sold for the afternoon concert featuring Crosby, Stills and Nash, Anita Baker, Linda Ronstadt, John Fogerty, the Four Tops and others.

The new site is the 20,000-seat Capital Centre in Landover. The concert will still be shown on a same-day, tape-delay basis by HBO, which paid $1.5 million to the nonprofit Welcome Home Inc. for the rights to the concert. According to an HBO spokesman, there will be no changes in the talent lineup.

There will probably be some complaints from ticket holders, however. Ticket sales policies to date have been unorthodox, at best. At first, all tickets were scheduled to be purchased for Vietnam veterans and their families by various corporate sponsors, but after fewer than a thousand were sold that way, tickets were put on sale to the public at $35 for the infield and $20 for the stadium. Then last week, a "limited number" of seats, including many in the infield, were put on sale for $10. Now, individuals who purchased tickets for the RFK show will have to return them for a refund and buy new tickets for the Capital Centre show. This time, the price is $15; tickets go on sale tomorrow.

"It's no secret that the ticket sales hadn't been going that well," HBO spokesperson Quentin Schaffer said yesterday. "And if you don't have a full house, there's not going to be any energy. It became clear we were not going to sell enough seats to justify using RFK Stadium, so we switched."